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Comparing deliantra/server/socket/lowlevel.C (file contents):
Revision 1.20 by root, Thu Dec 14 21:46:34 2006 UTC vs.
Revision 1.30 by pippijn, Sat Jan 6 14:42:31 2007 UTC

1/* 1/*
2 CrossFire, A Multiplayer game for X-windows 2 CrossFire, A Multiplayer game for X-windows
3 3
4 Copyright (C) 2005, 2006, 2007 Marc Lehmann & Crossfire+ Development Team
4 Copyright (C) 1992 Frank Tore Johansen 5 Copyright (C) 1992 Frank Tore Johansen
5 6
6 This program is free software; you can redistribute it and/or modify 7 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by 8 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or 9 the Free Software Foundation; either version 2 of the License, or
… …
33 */ 34 */
34 35
35using namespace std; 36using namespace std;
36 37
37#include <global.h> 38#include <global.h>
38#include <newclient.h>
39#include <sproto.h> 39#include <sproto.h>
40#include <cstdarg> 40#include <cstdarg>
41 41
42#ifdef __linux__ 42#ifdef __linux__
43# include <sys/types.h> 43# include <sys/types.h>
44# include <sys/socket.h> 44# include <sys/socket.h>
45# include <netinet/in.h> 45# include <netinet/in.h>
46# define TCP_HZ 1000 // sorry...
47# include <netinet/tcp.h> 46# include <netinet/tcp.h>
48#endif 47#endif
49 48
50// use a really low timeout, as it doesn't cost any bandwidth, and you can 49// use a really low timeout, as it doesn't cost any bandwidth, and you can
51// easily die in 20 seconds... 50// easily die in 20 seconds...
52#define SOCKET_TIMEOUT1 10 51#define SOCKET_TIMEOUT1 10 * 1000
53#define SOCKET_TIMEOUT2 20 52#define SOCKET_TIMEOUT2 20 * 1000
54 53
55void 54void
56client_socket::flush () 55client::flush ()
57{ 56{
57 if (destroyed ())
58 return;
59
58#ifdef __linux__ 60#ifdef __linux__
59 // check time of last ack, and, if too old, kill connection 61 // check time of last ack, and, if too old, kill connection
60 struct tcp_info tcpi; 62 struct tcp_info tcpi;
61 socklen_t len = sizeof (tcpi); 63 socklen_t len = sizeof (tcpi);
62 64
63 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi)) 65 if (!getsockopt (fd, IPPROTO_TCP, TCP_INFO, &tcpi, &len) && len == sizeof (tcpi))
64 { 66 {
65 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent; 67 unsigned int diff = tcpi.tcpi_last_ack_recv - tcpi.tcpi_last_data_sent;
66 68
69 rtt = tcpi.tcpi_rtt;
70 rttvar = tcpi.tcpi_rttvar;
71
67 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 * TCP_HZ < diff && diff < 0x80000000UL // ack delayed for 20s 72 if (tcpi.tcpi_unacked && SOCKET_TIMEOUT1 < diff && diff < 0x80000000UL // ack delayed for 20s
68 && SOCKET_TIMEOUT2 * TCP_HZ < tcpi.tcpi_last_data_sent) // no data sent for 10s 73 && SOCKET_TIMEOUT2 < tcpi.tcpi_last_data_sent) // no data sent for 10s
69 { 74 {
70 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd, 75 LOG (llevDebug, "Connection on fd %d closed due to ack timeout (%u/%u/%u)\n", fd,
71 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked); 76 (unsigned) tcpi.tcpi_last_ack_recv, (unsigned) tcpi.tcpi_last_data_sent, (unsigned) tcpi.tcpi_unacked);
72 status = Ns_Dead; 77 destroy ();
73 } 78 }
74 } 79 }
75#endif 80#endif
76 81
77 /** 82 /**
… …
86 91
87 write_outputbuffer (); 92 write_outputbuffer ();
88} 93}
89 94
90void 95void
91client_socket::write_outputbuffer () 96client::write_outputbuffer ()
92{ 97{
93 while (outputbuffer.len) 98 while (outputbuffer.len)
94 { 99 {
95 int res = write (fd, outputbuffer.data + outputbuffer.start, 100 int res = write (fd, outputbuffer.data + outputbuffer.start,
96 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start)); 101 min (outputbuffer.len, SOCKETBUFSIZE - outputbuffer.start));
… …
109#endif 114#endif
110 } 115 }
111 else if (res == 0) 116 else if (res == 0)
112 { 117 {
113 LOG (llevError, "socket write failed, connection closed.\n"); 118 LOG (llevError, "socket write failed, connection closed.\n");
114 status = Ns_Dead; 119 destroy ();
115 return; 120 return;
116 } 121 }
117 else if (errno == EINTR) 122 else if (errno == EINTR)
118 { 123 {
119 // just retry 124 // just retry
… …
126 return; 131 return;
127 } 132 }
128 else 133 else
129 { 134 {
130 LOG (llevError, "socket write failed: %s\n", strerror (errno)); 135 LOG (llevError, "socket write failed: %s\n", strerror (errno));
131 status = Ns_Dead; 136 destroy ();
132 return; 137 return;
133 } 138 }
134 } 139 }
135 140
136 socket_ev.poll (socket_ev.poll () & ~PE_W); 141 socket_ev.poll (socket_ev.poll () & ~PE_W);
137} 142}
138 143
144/******************************************************************************
145 *
146 * Start of read routines.
147 *
148 ******************************************************************************/
149
150int
151client::next_packet ()
152{
153 if (inbuf_len >= 2)
154 {
155 int pkt_len = (inbuf [0] << 8) | inbuf [1];
156
157 if (inbuf_len >= 2 + pkt_len)
158 return 2 + pkt_len;
159
160 if (inbuf_len == sizeof (inbuf))
161 {
162 send_packet_printf ("drawinfo %d input buffer overflow - closing connection.", NDI_RED);
163 destroy ();
164 return -1;
165 }
166 }
167
168 return 0;
169}
170
171void
172client::skip_packet (int len)
173{
174 inbuf_len -= len;
175 memmove (inbuf, inbuf + len, inbuf_len);
176}
177
139/*********************************************************************** 178/*****************************************************************************
140 * 179 * Start of command dispatch area.
141 * packet functions/utilities 180 * The commands here are protocol commands.
142 *
143 **********************************************************************/ 181 ****************************************************************************/
144 182
145packet &packet::operator <<(const data &v) 183// SocketCommand, PlayingCommand, should not exist with those ugly casts
184#define SC(cb) (void *)static_cast<void (*)(char *, int, client *)>(cb),
185#define PC(cb) (void *)static_cast<void (*)(char *, int, player *)>(cb), PF_PLAYER |
186
187/**
188 * Dispatch table for the server.
189 */
190static struct packet_type packets[] = {
191 {"ncom", PC(NewPlayerCmd) PF_PLAYING },
192 {"command", PC(PlayerCmd) PF_PLAYING },
193
194 {"examine", PC(ExamineCmd) PF_PLAYING },
195 {"apply", PC(ApplyCmd) PF_PLAYING },
196 {"lookat", PC(LookAt) PF_PLAYING },
197 {"lock", PC(LockItem) PF_PLAYING },
198 {"mark", PC(MarkItem) PF_PLAYING },
199 {"move", PC(MoveCmd) PF_PLAYING },
200 {"ext", PC(ExtCmd) 0 }, /* CF+ */
201 {"mapredraw", PC(MapRedrawCmd) 0 }, /* Added: phil */
202 {"mapinfo", PC(MapInfoCmd) 0 }, /* CF+ */
203
204 {"reply", SC(ReplyCmd) 0 },
205 {"exti", SC(ExtiCmd) 0 }, /* CF+ */
206 {"addme", SC(AddMeCmd) 0 },
207 {"askface", SC(SendFaceCmd) 0 }, /* Added: phil */
208 {"requestinfo", SC(RequestInfo) 0 },
209 {"setfacemode", SC(SetFaceMode) 0 },
210 {"setsound", SC(SetSound) 0 },
211 {"setup", SC(SetUp) 0 },
212 {"version", SC(VersionCmd) 0 },
213 {"toggleextendedinfos", SC(ToggleExtendedInfos) 0 }, /*Added: tchize */
214 {"toggleextendedtext", SC(ToggleExtendedText) 0 }, /*Added: tchize */
215 {"asksmooth", SC(AskSmooth) 0 }, /*Added: tchize (smoothing technologies) */
216};
217
218bool
219client::may_execute (const packet_type *pkt) const
146{ 220{
147 if (room () < v.len) 221 return (!(pkt->flags & PF_PLAYER) || pl)
148 reset (); 222 && (!(pkt->flags & PF_PLAYING) || state == ST_PLAYING);
223}
224
225void
226client::execute (const packet_type *pkt, char *data, int datalen)
227{
228 if (may_execute (pkt))
229 {
230 //TODO: only one format
231 if (pkt->flags & PF_PLAYER)
232 ((void (*)(char *, int, player *))pkt->cb)((char *)data, datalen, pl);
233 else
234 ((void (*)(char *, int, client *))pkt->cb)((char *)data, datalen, this);
235 }
149 else 236 else
237 send_packet_printf ("drawinfo %d ERROR: you cannot execute '%s' now.", NDI_RED, pkt->name);
238}
239
240bool
241client::handle_packet ()
242{
243 int pkt_len = next_packet ();
244
245 if (!pkt_len)
246 return false;
247 else if (pkt_len < 0)
248 {
249 LOG (llevError, "read error on player %s\n",
250 pl && pl->ob ? &pl->ob->name : "[anonymous]");
251 destroy ();
252 return false;
150 { 253 }
151 if (v.len) 254
255 inbuf [pkt_len] = 0; /* Terminate buffer - useful for string data */
256
257 /* First, break out beginning word. There are at least
258 * a few commands that do not have any paremeters. If
259 * we get such a command, don't worry about trying
260 * to break it up.
261 */
262 int datalen;
263 char *data = strchr ((char *)inbuf + 2, ' ');
264
265 if (data)
266 {
267 *data++ = 0;
268 datalen = pkt_len - (data - (char *)inbuf);
269 }
270 else
271 {
272 data = (char *)inbuf + 2; // better read garbage than segfault
273 datalen = 0;
274 }
275
276 for (packet_type *pkt = packets; pkt < packets + (sizeof (packets) / sizeof (packets[0])); ++pkt)
277 if (!strcmp ((char *)inbuf + 2, pkt->name))
152 { 278 {
153 memcpy (cur, v.ptr, v.len); 279 if (pkt->flags & PF_PLAYER)
154 cur += v.len; 280 queue_command (pkt, data, datalen);
281 else
282 execute (pkt, data, datalen);
283
284 goto next_packet;
155 } 285 }
286
287 // If we get here, we didn't find a valid command.
288 send_packet_printf ("drawinfo %d ERROR: command '%s' not supported.", NDI_RED, (char *)inbuf + 2);
289next_packet:
290 skip_packet (pkt_len);
291
292 // input buffer has space again
293 socket_ev.poll (socket_ev.poll () | PE_R);
294
295 return true;
296}
297
298// callback called when socket is either readable or writable
299void
300client::socket_cb (iow &w, int got)
301{
302 //TODO remove when we have better socket cleanup logic
303 if (destroyed ())
156 } 304 {
157 305 socket_ev.poll (0);
158 return *this; 306 return;
159}
160
161packet &packet::operator <<(const data8 &v)
162{
163 unsigned int len = min (v.len, 0x00FF);
164 return *this << uint8 (len) << data (v.ptr, len);
165}
166
167packet &packet::operator <<(const data16 &v)
168{
169 unsigned int len = min (v.len, 0xFFFF);
170 return *this << uint16 (len) << data (v.ptr, len);
171}
172
173packet &packet::operator <<(const char *v)
174{
175 return *this << data (v, strlen (v ? v : 0));
176}
177
178void
179packet::printf (const char *format, ...)
180{
181 int size = room ();
182
183 va_list ap;
184 va_start (ap, format);
185 int len = vsnprintf ((char *)cur, size, format, ap);
186 va_end (ap);
187
188 if (len >= size)
189 return reset ();
190
191 cur += len;
192}
193
194/******************************************************************************
195 *
196 * Start of read routines.
197 *
198 ******************************************************************************/
199
200int
201client_socket::read_packet ()
202{
203 for (;;)
204 { 307 }
205 if (inbuf_len >= 2)
206 {
207 unsigned int pkt_len = (inbuf [0] << 8) | inbuf [1];
208 308
209 if (inbuf_len >= 2 + pkt_len) 309 if (got & PE_W)
210 return pkt_len + 2; 310 {
211 } 311 write_outputbuffer ();
312
313 if (!outputbuffer.len)
314 socket_ev.poll (socket_ev.poll () & ~PE_W);
315 }
316
317 if (got & PE_R)
318 {
319 //TODO: rate-limit tcp connection in better ways, important
212 320
213 int amount = sizeof (inbuf) - inbuf_len; 321 int amount = sizeof (inbuf) - inbuf_len;
214 322
215 if (amount <= 0) 323 if (!amount)
216 { 324 {
217 LOG (llevError, "packet too large");//TODO 325 // input buffer full
326 socket_ev.poll (socket_ev.poll () & ~PE_R);
218 return -1; 327 return;
219 } 328 }
220 329
221 amount = read (fd, inbuf + inbuf_len, amount); 330 amount = read (fd, inbuf + inbuf_len, amount);
222 331
223 if (!amount) 332 if (!amount)
224 { 333 {
225 status = Ns_Dead; 334 destroy ();
226 return -1; 335 return;
227 } 336 }
228 else if (amount < 0) 337 else if (amount < 0)
229 { 338 {
230 if (errno != EAGAIN && errno != EINTR) 339 if (errno != EAGAIN && errno != EINTR)
231 { 340 {
232 LOG (llevError, "read error: %s\n", strerror (errno)); 341 LOG (llevError, "read error: %s\n", strerror (errno));
342 destroy ();
233 return -1; 343 return;
234 } 344 }
235 345
236 return 0; 346 // should not be here, normally
347 }
348 else
237 } 349 {
238
239 inbuf_len += amount; 350 inbuf_len += amount;
240 351
241 cst_tot.ibytes += amount; 352 cst_tot.ibytes += amount;
242 cst_lst.ibytes += amount; 353 cst_lst.ibytes += amount;
243 }
244}
245 354
355 cmd_ev.start ();
356 }
357 }
358}
359
360// called whenever we have additional commands to process
246void 361void
247client_socket::skip_packet (int len) 362client::cmd_cb (iw &w)
248{ 363{
249 inbuf_len -= len; 364 if (handle_packet ())
250 memmove (inbuf, inbuf + len, inbuf_len); 365 w.start ();
366 else
367 flush ();
251} 368}
252 369
253/******************************************************************************* 370/*******************************************************************************
254 * 371 *
255 * Start of write related routines. 372 * Start of write related routines.
… …
261 * 378 *
262 * ns is the socket we are adding the data to, buf is the start of the 379 * ns is the socket we are adding the data to, buf is the start of the
263 * data, and len is the number of bytes to add. 380 * data, and len is the number of bytes to add.
264 */ 381 */
265void 382void
266client_socket::send (void *buf_, int len) 383client::send (void *buf_, int len)
267{ 384{
268 char *buf = (char *)buf_; 385 char *buf = (char *)buf_;
269 char *pos = buf; 386 char *pos = buf;
270 int amt = 0; 387 int amt = 0;
271 388
272 if (status == Ns_Dead || !buf) 389 if (destroyed () || !buf)
273 {
274 LOG (llevDebug, "Write_To_Socket called with dead socket\n");
275 return; 390 return;
276 }
277 391
278 if ((len + outputbuffer.len) > SOCKETBUFSIZE) 392 if ((len + outputbuffer.len) > SOCKETBUFSIZE)
279 { 393 {
280 LOG (llevDebug, "Socket on fd %d has overrun internal buffer - marking as dead\n", fd); 394 LOG (llevDebug, "socket on fd %d has overrun internal buffer - marking as dead\n", fd);
281 status = Ns_Dead; 395 destroy ();
282 return; 396 return;
283 } 397 }
284 398
285 int avail, end; 399 int avail, end;
286 400
… …
304 } 418 }
305 419
306 outputbuffer.len += len; 420 outputbuffer.len += len;
307} 421}
308 422
309void
310client_socket::socket_cb (iow &w, int got)
311{
312 write_outputbuffer ();
313
314 if (!outputbuffer.len)
315 socket_ev.poll (socket_ev.poll () & ~PE_W);
316}
317
318/** 423/**
319 * Takes a string of data, and writes it out to the socket. A very handy 424 * Takes a string of data, and writes it out to the socket. A very handy
320 * shortcut function. 425 * shortcut function.
321 */ 426 */
322void 427void
323client_socket::send_packet (packet &sl) 428client::send_packet (packet &sl)
324{ 429{
325 if (status == Ns_Dead) 430 if (destroyed ())
326 return; 431 return;
327 432
328 if (sl.length () >= MAXSOCKBUF) 433 if (sl.length () >= MAXSOCKBUF)
329 { 434 {
330 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ()); 435 LOG (llevError, "Trying to send a buffer beyond properly size, len =%d\n", sl.length ());
… …
344 449
345 send (sl.buf_, sl.length () + sl.hdrlen); 450 send (sl.buf_, sl.length () + sl.hdrlen);
346} 451}
347 452
348void 453void
349client_socket::send_packet (const char *buf, int len) 454client::send_packet (const char *buf, int len)
350{ 455{
351 packet sl; 456 packet sl;
352 457
353 sl << data (buf, len); 458 sl << data (buf, len);
354 send_packet (sl); 459 send_packet (sl);
355} 460}
356 461
357void 462void
358client_socket::send_packet (const char *buf) 463client::send_packet (const char *buf)
359{ 464{
360 send_packet (buf, strlen (buf)); 465 send_packet (buf, strlen (buf));
466}
467
468void
469client::send_packet_printf (const char *format, ...)
470{
471 packet sl;
472
473 va_list ap;
474 va_start (ap, format);
475 sl.vprintf (format, ap);
476 va_end (ap);
477
478 send_packet (sl);
479}
480
481/***********************************************************************
482 *
483 * packet functions/utilities
484 *
485 **********************************************************************/
486
487packet::packet (const char *name)
488{
489 reset ();
490
491 int len = strlen (name);
492 memcpy (cur, name, len); cur += len;
493 *cur++ = ' ';
494}
495
496packet &packet::operator <<(const data &v)
497{
498 if (room () < v.len)
499 reset ();
500 else
501 {
502 if (v.len)
503 {
504 memcpy (cur, v.ptr, v.len);
505 cur += v.len;
506 }
507 }
508
509 return *this;
510}
511
512packet &packet::operator <<(const data8 &v)
513{
514 unsigned int len = min (v.len, 0x00FF);
515 return *this << uint8 (len) << data (v.ptr, len);
516}
517
518packet &packet::operator <<(const data16 &v)
519{
520 unsigned int len = min (v.len, 0xFFFF);
521 return *this << uint16 (len) << data (v.ptr, len);
522}
523
524packet &packet::operator <<(const char *v)
525{
526 return *this << data (v, strlen (v ? v : 0));
527}
528
529void
530packet::vprintf (const char *format, va_list ap)
531{
532 int size = room ();
533
534 int len = vsnprintf ((char *)cur, size, format, ap);
535
536 if (len >= size)
537 return reset ();
538
539 cur += len;
361} 540}
362 541
363/****************************************************************************** 542/******************************************************************************
364 * 543 *
365 * statistics logging functions. 544 * statistics logging functions.

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